Abstract
The upland rice is grown in most Brazilian states. However, in many of them the yield obtained is low. The choice of cultivar more suited to a particular environment can contribute to increased productivity of this crop. This research aimed to evaluate the performance of a hybrid cultivar of upland rice (Ecco) and five conventional cultivars (BRS Monarca, BRS Primavera, AN Cambará, BRS Sertaneja and BRS MG Curinga) in two environments (Vilhena and Cerejeiras). The tests were conducted in the agricultural year 2010/2011. We evaluated the following characteristics: tillering, panicle number per unit area, number of filled grains per panicle sterile, mass of grains per panicle, 1000 grain weight, grain yield (kg·ha-1) and whole grain yield. There was no cultivar x environment interaction for all traits. Greater tillering, higher panicle number per area, higher productivity and yield of whole grains in the municipality of Cerejeiras were observed, while the highest number of sterile grains per panicle was obtained in Vilhena. The hybrid Ecco highlighted in relation to all other cultivars is in relation to tillering, panicle number per area and grain yield. The municipality of Cerejeiras is the most suitable for the cultivation of upland rice.
Highlights
By 2025 the world population will reach eight billion people, with 80% of those are in developing countries, and these countries will require a rational and efficient production to meet the demand of this population [1]
The state of Rio Grande do Sul is responsible for 67% of Brazilian production of rice, which is grown in irrigated system [4]
With respect to tillering and panicle number per area, Ecco hybrid was superior to all other cultivars (Table 2)
Summary
By 2025 the world population will reach eight billion people, with 80% of those are in developing countries, and these countries will require a rational and efficient production to meet the demand of this population [1].Among the cereals of great social and economic importance in the world, highlights the rice (Oryza sativa L.), which is an energy source for two-thirds of the world population, providing about 20% of energy and 15% of the protein that human needs [2]. In Brazil, rice is a major annual crop grown in all regions of the country [3]. The state of Rio Grande do Sul is responsible for 67% of Brazilian production of rice, which is grown in irrigated system [4]. In other states rice cultivation is mainly done in rainfed system. The cultivation of upland rice is characterized by the aerobic condition of root development of the plant. This farming system is found predominantly in Brazil and to a lesser extent in Africa [5]
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